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3 years ago

A 0.450-kg soccer ball has a kinetic energy of 119 J. What is the velocity of the soccer ball?

Physics

1 answer:

Elis [28]3 years ago

3 0

Answer: 23m/s

Explanation:

Given that:

Mass of soccer ball = 0.450kg

kinetic energy = 119 J

velocity of the soccer ball = ?

Kinetic energy is the energy possessed by a moving object. It is measured in joules, and depends on the mass (m) of the object and the velocity (v) by which it moves

i.e K.E = 1/2mv^2

119J = 1/2 x 0.450kg x v^2

119J = 0.225kg x v^2

v^2 = 119J / 0.225kg

v^2 = 528.9

To get the value of velocity, find the square root of v

v = √528.9

v = 22.997m/s (Round result to 23)

Thus, the velocity of the soccer ball is 23m/s

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jek_recluse [69]

Answer:

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% $e=1.43$ %

Explanation:

From the exercise we know two information. The real speed and the experimental measured by the speedometer

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Since the speedometer is only accurate to within 0.1km/h the experimental speed is

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Knowing that we can calculate Kinetic energy for the real and experimental speed

$E_{r}=\frac{1}{2}mv^2=\frac{1}{2}(61000g)(2.77m/s)^2=234023J$

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Now, the potential error in her calculated kinetic energy is:

$e=E_{r}-E_{e}=(234023-230656)J=3367.2J$

% $e=\frac{E_{r}-E_{e}}{E_{r}}x100=\frac{(234023-230656)J}{234023J}x100=1.43$ %

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Explain in your own words how the Doppler Effect is also applicable in our study of light.

arlik [135]

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A radio station broadcasts its music with waves at a frequency of 7.34 x 10²Hz. These radio waves travel at a speed of 3.00x 10%

Lorico [155]

Answer:

See below

Explanation:

<u>I will use 3 x 10^8 m/s for speed or wave</u>

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w = <u>408719. 3 meters </u>

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